CN112812775A - Fluorescent material - Google Patents
Fluorescent material Download PDFInfo
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- CN112812775A CN112812775A CN201911126981.3A CN201911126981A CN112812775A CN 112812775 A CN112812775 A CN 112812775A CN 201911126981 A CN201911126981 A CN 201911126981A CN 112812775 A CN112812775 A CN 112812775A
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/7734—Aluminates
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Abstract
The invention relates to a fluorescent material, which is represented by a chemical formula of NaxKyEu1‑x‑yLi3SiO4Wherein x is a number from 0.25 to 0.95 and y is a number from 0.01 to 0.85. The disclosed fluorescent materials have emission spectra with half-widths of about 20nm, which are useful for a variety of industrial lighting applications.
Description
Technical Field
The invention relates to a fluorescent material, in particular to a blue light fluorescent material.
Background
With the progress of science and technology, fluorescent materials are widely used in daily life nowadays. Due to the shift of human life patterns, luminescent materials are continuously researched and developed to meet market demands. Devices ranging from Cold Cathode Fluorescent Lamps (CCFLs), Plasma Display Panels (PDPs), liquid crystal display panels (LCDs), organic light emitting diode display panels (OLEDs), electroluminescent display panels (ELDs) to white Light Emitting Diodes (LEDs) have fluorescent materials applied thereto.
The characteristics of the fluorescent material are closely related to the quality of the product to which it is applied, for example, luminous efficiency, luminous half width (FWHM), luminous lifetime, or luminous quantum yield. However, the current fluorescent materials still need to be continuously improved to meet the industry's requirements for the above characteristics, such as blue-light fluorescent materials.
Disclosure of Invention
The invention aims at the blue fluorescent material with the emission spectrum with the half width of about 20nm, which is beneficial to various industries for other luminescent applications.
The purpose of the invention is realized by the following technical scheme.
In various embodiments of the present disclosure, the fluorescent material is represented by the formula NaxKyEu1-x- yLi3SiO4Wherein x is a number from 0.25 to 0.95 and y is a number from 0.01 to 0.85.
The object of the invention is achieved by the following technical measures.
In various embodiments of the present disclosure, x is greater than or equal to 0.35, but less than or equal to 0.85.
In various embodiments of the present disclosure, x is 0.37, 0.47, 0.57, 0.67, 0.77, or 0.87.
In various embodiments of the present disclosure, y is greater than or equal to 0.05, but less than or equal to 0.65.
In various embodiments of the present disclosure, y is 0.1, 0.2, 0.3, 0.4, or 0.5.
In various embodiments of the present disclosure, the ratio of x/y is about 0.45 to about 1.5.
In various embodiments of the present disclosure, the ratio of x/y is about 1.8 to about 6.
In various embodiments of the present disclosure, the fluorescent material generates an emission spectrum under excitation of blue light having a wavelength of about 420nm, wherein the emission spectrum has a wavelength ranging from about 450nm to about 600nm, and the emission spectrum has a peak at a wavelength ranging from about 480nm to about 490 nm.
Compared with the prior art, the invention has obvious advantages and beneficial effects.
The present disclosure provides a blue-emitting phosphor having an emission spectrum with a half-width of about 20nm, which is useful for various industrial lighting applications. In addition, the process of the fluorescent material of the present disclosure is very general and convenient, so that those skilled in the art can prepare and obtain the fluorescent material with low cost.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is an emission spectrum according to various embodiments of the present invention.
FIG. 2 is an emission spectrum according to various embodiments of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the fluorescent material according to the present invention, its specific embodiments, structures, features and effects will be provided in conjunction with the accompanying drawings and preferred embodiments.
In the description and claims, the terms "a" and "an" can be used broadly to refer to a single or to a plurality of elements, unless the context specifically states otherwise. As used herein, the terms "about," "approximately," or "approximately" generally refer to a numerical error or range that is within about twenty percent, preferably within about ten percent, and more preferably within about five percent.
The invention provides a fluorescent material which can be expressed by a chemical formula of NaxKyEu1-x-yLi3SiO4Wherein x is a number from 0.25 to 0.95 and y is a number from 0.01 to 0.85.
According to an embodiment of the invention, x is greater than or equal to 0.35, but less than or equal to 0.85, for example 0.37, 0.47, 0.57, 0.67, 0.77 or 0.87. y is preferably a number greater than or equal to 0.05 but less than or equal to 0.65, for example 0.1, 0.2, 0.3, 0.4 or 0.5.
The fluorescent material according to various embodiments of the present invention has a special light emission characteristic, and the excitation light with a wavelength of 420nm excites the fluorescent material of the present invention, so that the fluorescent material of the present invention emits an emission spectrum in a blue light region. More specifically, the present invention is described in more detail,the emission spectrum has a wavelength ranging from about 450nm to about 600 nm. In some embodiments, the photoluminescent Quantum Yield (PLQY) of the fluorescent material is greater than 80%. Can be further adjusted by adjusting the fluorescent material NaxKyEu1-x-yLi3SiO4The Moore ratio of the medium Na/K is used for adjusting the waveform of the luminescence spectrum of the fluorescent material. The higher the x/y ratio, the narrower the waveform of the luminescence spectrum. The lower the ratio of x/y, the wider the waveform of the luminescence spectrum. In some embodiments, the x/y ratio is from about 0.45 to about 1.5, and the emission spectrum has a wavelength in the range of from about 450nm to about 600nm, resulting in a broad emission peak. In still other embodiments, the ratio of x/y is from about 1.8 to about 6 and the emission spectrum produces a narrower emission peak having a main emission peak with a half-width of about 20 nm. The present invention will be described in further detail with reference to examples.
EXAMPLE 1 Synthesis of Na0.47K0.5Eu0.03Li3SiO4Fluorescent material:
mixing sodium oxide, potassium oxide, europium oxide, lithium carbonate and silicon oxide according to the proportion of the chemical formula, putting the mixture into a ball milling tank, and adding a proper amount of ethanol as a medium to assist in mixing. Then, the mixture was ground and mixed by a ball mill for about 8 to 10 hours, and the resulting mixed slurry was dried to obtain a precursor powder. Then, the precursor powder was put into a high-temperature furnace and calcined at a holding temperature of about 750 ℃ for about 5 hours, and the atmosphere during calcination was a reducing gas, whereby the fluorescent material Na of example 1 was obtained0.47K0.5Eu0.03Li3SiO4。
FIG. 1 shows the emission spectrum obtained by exciting the fluorescent material of example 1 with blue light having a wavelength of 420nm, the ordinate of which is the intensity of the emitted light and the abscissa of which is the wavelength of the emitted light. As can be seen from fig. 1, a broad luminescence peak can be generated in the range of 450nm to 650nm, wherein the emission spectrum has a main peak at a wavelength of about 485nm and a secondary peak at a wavelength of about 530nm to about 540 nm. The wavelength of the maximum luminous intensity of this embodiment is about 485 nm. The fluorescent material of embodiment 1 of the present invention can emit an emission spectrum with a wavelength in the blue light region after being excited by the blue light with a wavelength of 420nm, which indicates that the fluorescent material of embodiment 1 of the present invention is a blue light fluorescent material.
Example 2 Synthesis of Na0.77K0.2Eu0.03Li3SiO4Fluorescent material:
mixing sodium oxide, potassium oxide, europium oxide, lithium carbonate and silicon oxide according to the proportion of the chemical formula, putting the mixture into a ball milling tank, and adding a proper amount of ethanol as a medium to assist in mixing. Then, the mixture was ground and mixed by a ball mill for about 8 to 10 hours, and the resulting mixed slurry was dried to obtain a precursor powder. Then, the precursor powder was put into a high-temperature furnace and calcined at a holding temperature of about 750 ℃ for about 5 hours, and the atmosphere during calcination was a reducing gas, whereby the fluorescent material Na of example 1 was obtained0.77K0.2Eu0.03Li3SiO4。
FIG. 2 shows the emission spectrum obtained by exciting the fluorescent material of example 1 with blue light having a wavelength of 420nm, the ordinate of which is the intensity of the emitted light and the abscissa of which is the wavelength of the emitted light. As can be seen from FIG. 1, the emission spectrum has a peak at a wavelength of about 485nm and a half-width of about 20 nm. The wavelength of the maximum luminous intensity of this embodiment is about 485 nm. The fluorescent material of embodiment 1 of the present invention can emit an emission spectrum with a wavelength in the blue light region after being excited by the blue light with a wavelength of 420nm, which indicates that the fluorescent material of embodiment 1 of the present invention is a blue light fluorescent material.
As is clear from FIGS. 1 and 2, the fluorescent material Na can be further adjusted by passing throughxKyEu1-x-yLi3SiO4The Moore ratio of the medium Na/K is used for adjusting the waveform of the luminescence spectrum of the fluorescent material. Therefore, the fluorescent material Na can be adjustedxKyEu1-x-yLi3SiO4The values of x and y in (b) adjust the emission spectrum of the fluorescent material.
While the foregoing is directed to embodiments of the present disclosure, other and further embodiments of the disclosure may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (8)
1. A fluorescent material characterized in that it has a chemical formula of NaxKyEu1-x-yLi3SiO4Wherein x is a number from 0.25 to 0.95 and y is a number from 0.01 to 0.85.
2. The phosphor of claim 1, wherein x is greater than or equal to 0.35 and less than or equal to 0.85.
3. A luminescent material as claimed in claim 2, characterized in that x is 0.37, 0.47, 0.57, 0.67, 0.77 or 0.87.
4. The phosphor of claim 2, wherein y is greater than or equal to 0.05 and less than or equal to 0.65.
5. The phosphor of claim 4, wherein y is 0.1, 0.2, 0.3, 0.4, or 0.5.
6. The phosphor of claim 1, wherein the ratio of x/y is from 0.45 to about 1.5.
7. The phosphor of claim 1, wherein the ratio of x/y is 1.8 to 6.
8. The phosphor of claim 1, wherein the phosphor produces an emission spectrum under excitation by blue light having a wavelength of 420nm, the emission spectrum having a wavelength in the range of 450nm to 600nm, and wherein the emission spectrum has a peak at a wavelength of 480nm to 490 nm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911126981.3A CN112812775A (en) | 2019-11-18 | 2019-11-18 | Fluorescent material |
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| CN201911126981.3A CN112812775A (en) | 2019-11-18 | 2019-11-18 | Fluorescent material |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108753277A (en) * | 2018-07-10 | 2018-11-06 | 北京科技大学 | White light LEDs narrow-band blue light fluorescent powder and preparation method and White LED light-emitting device |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108753277A (en) * | 2018-07-10 | 2018-11-06 | 北京科技大学 | White light LEDs narrow-band blue light fluorescent powder and preparation method and White LED light-emitting device |
Non-Patent Citations (2)
| Title |
|---|
| MING ZHAO ET AL.,: ""Emerging ultra-narrow-band cyan-emitting phosphor for white LEDs with enhanced color rendition"", 《LIGHT: SCIENCE & APPLICATIONS》 * |
| XIAOYONG HUANG: ""Cyan phosphors for full-visible-spectrum lighting: shining new light on high-CRI white pc-LEDs"", 《SCIENCE BULLETIN》 * |
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